The generator matrix

 1  0  1  1  1  4  1  1  0  0  1  1  1  1  6  1  1  2  1  1  0  1  4  1  2  1  1  0  1  4  1  6  1  1  0  2  1  1  1  1  4  1  2  4  4  1  1  2  1  1  4  1  4  1  1  1  1  1  1  1  2  2  1  6  1  1  1  1  0  2  4
 0  1  1  0  1  1  4  3  1  1  0  7  5  4  1  1  4  1  4  3  1  1  1  4  1  4  1  1  2  1  3  1  1  6  1  1  5  2  7  3  1  2  1  1  1  5  5  1  6  1  1  4  1  6  1  5  4  2  2  3  1  1  2  1  3  5  5  0  1  0  0
 0  0  2  0  0  0  0  4  4  4  0  0  4  6  2  6  6  6  2  6  6  6  2  6  0  0  0  6  6  6  4  0  2  0  6  4  6  0  6  4  4  4  0  6  2  4  6  0  4  0  2  4  2  6  4  4  6  0  2  6  6  6  6  0  6  0  4  6  4  4  2
 0  0  0  2  0  0  4  0  6  6  6  2  6  6  6  2  0  2  6  4  0  6  4  0  2  4  6  2  2  0  2  4  0  6  4  6  4  2  4  0  0  6  2  4  2  6  2  6  4  4  2  4  4  4  0  4  6  4  2  6  4  6  6  4  2  2  2  0  2  2  2
 0  0  0  0  2  6  6  0  6  0  2  4  2  2  4  4  6  2  0  6  6  6  0  4  0  2  4  6  6  2  6  2  4  0  0  6  2  4  4  6  4  6  4  4  4  4  0  0  0  2  0  2  2  2  4  4  4  2  0  2  4  0  6  0  2  0  4  2  2  2  6

generates a code of length 71 over Z8 who´s minimum homogenous weight is 64.

Homogenous weight enumerator: w(x)=1x^0+142x^64+120x^65+404x^66+216x^67+395x^68+300x^69+422x^70+276x^71+371x^72+288x^73+354x^74+208x^75+275x^76+124x^77+84x^78+4x^79+38x^80+40x^82+17x^84+6x^86+7x^88+2x^90+1x^92+1x^96

The gray image is a code over GF(2) with n=284, k=12 and d=128.
This code was found by Heurico 1.16 in 0.886 seconds.